Development of ultrasonic-assisted cutting for gradient wettability in a one-pass process and three-dimensional contact angle analysis

• Project/Area Number: 18K13666
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Tohoku University
• Principal Investigator: Shimada Keita 東北大学, 工学研究科, 助教 (30633383)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 超音波援用切削 / 表面微細構造 / 濡れ性 / 熱力学的接触角解析 / 微細構造 / 超音波援用加工 / 傾斜構造

Outline of Final Research Achievements

Wettability gradient structures were achieved with ultrasonic-assisted face-milling process that fabricated a surface with varying microtexture that affected the wetting characteristics. The elliptical vibration cutting fabricated micropyramid and microfrustum arrays (MPA and MFA) and they were more hydrophobic than a flat surface. Additionally, the MFA surface was more hydrophobic than MPA when their top surfaces were small compared with the depth; the wettability became close to that of a flat surface when the top surfaces became larger. The thermodynamic contact angle analysis computed the penetration depth of droplet into the grooves.

Academic Significance and Societal Importance of the Research Achievements

超音波振動切削を用いることにより機械加工により微細構造の創成すること，そしてその構造が濡れ性へ影響を与えること，およびその程度について評価を行った．この加工は精度を追及する技術とは異なり機能性を与える手法として用いることができる可能性を示したものでありこの後の応用性を示した意義は大きい．一方，現時点および本研究での機械加工のみを用いての濡れ性制御できる程度については接触角で40度程度が上限であったことも利用の範囲を示した点で意義がある．

Research Products

• [Journal Article] Ultrasonic-Assisted Face Milling for Fabricating Hierarchical Microstructures (2020)
  • Author(s): Shimada Keita、Chen Ziqi、Mizutani Masayoshi、Kuriyagawa Tsunemoto、Graduate School of Engineering, Tohoku University 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan、Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
  • Journal Title: International Journal of Automation Technology Volume: 14 Issue: 2 Pages: 238-244
  • DOI: 10.20965/ijat.2020.p0238
  • NAID: 130007806078
  • ISSN: 1881-7629, 1883-8022
  • Year and Date: 2020-03-05
  • Peer Reviewed / Open Access
• [Journal Article] Unidirectional Wetting Surfaces Fabricated by Ultrasonic-Assisted Cutting (2019)
  • Author(s): Keita Shimada, Takuya Hirai, Masayoshi Mizutani, and Tsunemoto Kuriyagawa
  • Journal Title: International Journal of Automation Technology Volume: 13 Issue: 2 Pages: 191-198
  • DOI: 10.20965/ijat.2019.p0191
  • NAID: 130007607757
  • ISSN: 1881-7629, 1883-8022
  • Year and Date: 2019-03-05
  • Peer Reviewed / Open Access
• [Presentation] Micrometer-scaled hierarchical structures fabricated by ultrasonic-assisted cutting (2019)
  • Author(s): Keita Shimada, Ziqi Chen, Masayoshi Mizutani, Tsunemoto Kuriyagawa
  • Organizer: The 15th China-Japan International Conference on Ultra-Precision Machining Process
  • Int'l Joint Research